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Fair Value Measurements Fair Value, Assets Measured on Nonrecurring Basis Using Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Nonrecurring fair value losses $ (96) $ (84) $ (119)
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member]
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Total Fair Value 256 96  
Nonrecurring fair value losses (96) (76)  
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member] | Operating Lease Equipment [Member]
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Nonrecurring fair value losses (81) (55)  
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member] | Property, Plant and Equipment [Member]
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Nonrecurring fair value losses (15) (21)  
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Operating Lease Equipment, Fair Value 216 75  
Fair Value Measurements Nonrecurring [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]      
Property, Plant, and Equipment, Fair Value $ 40 $ 21